These parties have state affiliations or chapters in Colorado. For issues see a list of Colorado Special Interest Groups.
789 Sherman Street,Suite 110, Denver, CO 80203; Phone: 303-623-4762; Fax: 303-623-2443
5950 S. Willow Drive, Suite 210, Greenwood Village, CO 80111; Phone: 303-758-3333; Fax: 303-753-4611
1100 Denver Avenue,, Fort Lupton, CO 80621; Phone: 303-399-5067; Email: acp4co@gmail.com
PO Box 653, Littleton, CO 80160; Phone: 720-439-6000; Email: info@ApprovalVotingParty.com
C/O 617 29 3/8 Rd., Grand Junction, CO 81504; Phone: 970-697-0022; Email: contact@coloradogreenparty.org
11757 W Ken Caryl Ave #F124, Littleton, CO 80127; Phone: 303-837-9393; Email: statechair@lpcolorado.org
c/o Critter Milton, 400 N Park Ave, Unit 10B, Breckenridge, CO 80424; Email: mail@unityparty.us
"Think tanks are independent organizations that engage in politics and public policy. They are distinct from political associations because they are generally not membership organizations...." (Source: Kurian, George Thomas and Jeffrey D. Schultz, Political Market Place USA, (Phoenix: Oryx Press, 1999).
These sources identify the most important think tanks.